prog8/compiler/test/TestOptimization.kt

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package prog8tests
import io.kotest.assertions.fail
import io.kotest.assertions.withClue
import io.kotest.core.spec.style.FunSpec
import io.kotest.matchers.shouldBe
import io.kotest.matchers.shouldNotBe
import io.kotest.matchers.string.shouldContain
import io.kotest.matchers.types.instanceOf
import io.kotest.matchers.types.shouldBeSameInstanceAs
import prog8.ast.Program
import prog8.ast.base.DataType
import prog8.ast.base.ParentSentinel
import prog8.ast.base.Position
import prog8.ast.expressions.*
import prog8.ast.statements.*
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import prog8.codegen.target.C64Target
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import prog8.compiler.astprocessing.processAstBeforeAsmGeneration
import prog8.compiler.printProgram
import prog8.compilerinterface.CompilationOptions
import prog8.compilerinterface.LauncherType
import prog8.compilerinterface.OutputType
import prog8.compilerinterface.ZeropageType
import prog8tests.helpers.*
class TestOptimization: FunSpec({
test("remove empty subroutine except start") {
val sourcecode = """
main {
sub start() {
}
sub empty() {
; going to be removed
}
}
"""
val result = compileText(C64Target, true, sourcecode).assertSuccess()
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val toplevelModule = result.program.toplevelModule
val mainBlock = toplevelModule.statements.single() as Block
val startSub = mainBlock.statements.single() as Subroutine
result.program.entrypoint shouldBeSameInstanceAs startSub
withClue("only start sub should remain") {
startSub.name shouldBe "start"
}
withClue("compiler has inserted return in empty subroutines") {
startSub.statements.single() shouldBe instanceOf<Return>()
}
}
test("don't remove empty subroutine if it's referenced") {
val sourcecode = """
main {
sub start() {
uword xx = &empty
xx++
}
sub empty() {
; should not be removed
}
}
"""
val result = compileText(C64Target, true, sourcecode).assertSuccess()
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val toplevelModule = result.program.toplevelModule
val mainBlock = toplevelModule.statements.single() as Block
val startSub = mainBlock.statements[0] as Subroutine
val emptySub = mainBlock.statements[1] as Subroutine
result.program.entrypoint shouldBeSameInstanceAs startSub
startSub.name shouldBe "start"
emptySub.name shouldBe "empty"
withClue("compiler has inserted return in empty subroutines") {
emptySub.statements.single() shouldBe instanceOf<Return>()
}
}
test("generated constvalue from typecast inherits proper parent linkage") {
val number = NumericLiteralValue(DataType.UBYTE, 11.0, Position.DUMMY)
val tc = TypecastExpression(number, DataType.BYTE, false, Position.DUMMY)
val program = Program("test", DummyFunctions, DummyMemsizer, DummyStringEncoder)
tc.linkParents(ParentSentinel)
tc.parent shouldNotBe null
number.parent shouldNotBe null
tc shouldBeSameInstanceAs number.parent
val constvalue = tc.constValue(program)!!
constvalue shouldBe instanceOf<NumericLiteralValue>()
constvalue.number shouldBe 11.0
constvalue.type shouldBe DataType.BYTE
constvalue.parent shouldBeSameInstanceAs tc.parent
}
test("generated constvalue from prefixexpr inherits proper parent linkage") {
val number = NumericLiteralValue(DataType.UBYTE, 11.0, Position.DUMMY)
val pfx = PrefixExpression("-", number, Position.DUMMY)
val program = Program("test", DummyFunctions, DummyMemsizer, DummyStringEncoder)
pfx.linkParents(ParentSentinel)
pfx.parent shouldNotBe null
number.parent shouldNotBe null
pfx shouldBeSameInstanceAs number.parent
val constvalue = pfx.constValue(program)!!
constvalue shouldBe instanceOf<NumericLiteralValue>()
constvalue.number shouldBe -11.0
constvalue.type shouldBe DataType.BYTE
constvalue.parent shouldBeSameInstanceAs pfx.parent
}
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test("const folding multiple scenarios +/-") {
val source = """
main {
const ubyte boardHeightC = 20
const ubyte boardOffsetC = 3
sub start() {
uword load_location = 12345
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word llw = 12345
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cx16.r0 = load_location + 8000 + 1000 + 1000
cx16.r2 = 8000 + 1000 + 1000 + load_location
cx16.r4 = load_location + boardOffsetC + boardHeightC - 1
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cx16.r5s = llw - 900 - 999
cx16.r7s = llw - 900 + 999
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}
}"""
val result = compileText(C64Target, true, source, writeAssembly = false).assertSuccess()
// expected:
// uword load_location
// load_location = 12345
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// word llw
// llw = 12345
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// cx16.r0 = load_location
// cx16.r0 += 10000
// cx16.r2 = load_location
// cx16.r2 += 10000
// cx16.r4 = load_location
// cx16.r4 += 22
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// cx16.r5s = llw
// cx16.r5s -= 1899
// cx16.r7s = llw
// cx16.r7s += 99
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val stmts = result.program.entrypoint.statements
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stmts.size shouldBe 14
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val addR0value = (stmts[5] as Assignment).value
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val binexpr0 = addR0value as BinaryExpression
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binexpr0.operator shouldBe "+"
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binexpr0.right shouldBe NumericLiteralValue(DataType.UWORD, 10000.0, Position.DUMMY)
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val addR2value = (stmts[7] as Assignment).value
val binexpr2 = addR2value as BinaryExpression
binexpr2.operator shouldBe "+"
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binexpr2.right shouldBe NumericLiteralValue(DataType.UWORD, 10000.0, Position.DUMMY)
val addR4value = (stmts[9] as Assignment).value
val binexpr4 = addR4value as BinaryExpression
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binexpr4.operator shouldBe "+"
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binexpr4.right shouldBe NumericLiteralValue(DataType.UWORD, 22.0, Position.DUMMY)
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val subR5value = (stmts[11] as Assignment).value
val binexpr5 = subR5value as BinaryExpression
binexpr5.operator shouldBe "-"
binexpr5.right shouldBe NumericLiteralValue(DataType.UWORD, 1899.0, Position.DUMMY)
val subR7value = (stmts[13] as Assignment).value
val binexpr7 = subR7value as BinaryExpression
binexpr7.operator shouldBe "+"
binexpr7.right shouldBe NumericLiteralValue(DataType.UWORD, 99.0, Position.DUMMY)
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}
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test("const folding multiple scenarios * and /") {
val source = """
main {
sub start() {
word llw = 300
cx16.r0s = 9 * 2 * 10 * llw
cx16.r1s = llw * 9 * 2 * 10
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cx16.r2s = llw / 30 / 3
cx16.r3s = llw / 2 * 10
cx16.r4s = llw * 90 / 5 ; not optimized because of loss of integer division precision
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}
}"""
val result = compileText(C64Target, true, source, writeAssembly = false).assertSuccess()
printProgram(result.program)
// expected:
// word llw
// llw = 300
// cx16.r0s = llw
// cx16.r0s *= 180
// cx16.r1s = llw
// cx16.r1s *= 180
// cx16.r2s = llw
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// cx16.r2s /= 90
// cx16.r3s = llw
// cx16.r3s *= 5
// cx16.r4s = llw
// cx16.r4s *= 90
// cx16.r4s /= 5
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val stmts = result.program.entrypoint.statements
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stmts.size shouldBe 13
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val mulR0Value = (stmts[3] as Assignment).value
val binexpr0 = mulR0Value as BinaryExpression
binexpr0.operator shouldBe "*"
binexpr0.right shouldBe NumericLiteralValue(DataType.UWORD, 180.0, Position.DUMMY)
val mulR1Value = (stmts[5] as Assignment).value
val binexpr1 = mulR1Value as BinaryExpression
binexpr1.operator shouldBe "*"
binexpr1.right shouldBe NumericLiteralValue(DataType.UWORD, 180.0, Position.DUMMY)
val divR2Value = (stmts[7] as Assignment).value
val binexpr2 = divR2Value as BinaryExpression
binexpr2.operator shouldBe "/"
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binexpr2.right shouldBe NumericLiteralValue(DataType.UWORD, 90.0, Position.DUMMY)
val mulR3Value = (stmts[9] as Assignment).value
val binexpr3 = mulR3Value as BinaryExpression
binexpr3.operator shouldBe "*"
binexpr3.right shouldBe NumericLiteralValue(DataType.UWORD, 5.0, Position.DUMMY)
val mulR4Value = (stmts[11] as Assignment).value
val binexpr4 = mulR4Value as BinaryExpression
binexpr4.operator shouldBe "*"
binexpr4.right shouldBe NumericLiteralValue(DataType.UWORD, 90.0, Position.DUMMY)
val divR4Value = (stmts[12] as Assignment).value
val binexpr4b = divR4Value as BinaryExpression
binexpr4b.operator shouldBe "/"
binexpr4b.right shouldBe NumericLiteralValue(DataType.UWORD, 5.0, Position.DUMMY)
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}
test("constantfolded and silently typecasted for initializervalues") {
val sourcecode = """
main {
sub start() {
const ubyte TEST = 10
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byte @shared x1 = TEST as byte + 1
byte @shared x2 = 1 + TEST as byte
ubyte @shared y1 = TEST + 1 as byte
ubyte @shared y2 = 1 as byte + TEST
}
}
"""
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val result = compileText(C64Target, false, sourcecode).assertSuccess()
val mainsub = result.program.entrypoint
mainsub.statements.size shouldBe 10
val declTest = mainsub.statements[0] as VarDecl
val declX1 = mainsub.statements[1] as VarDecl
val initX1 = mainsub.statements[2] as Assignment
val declX2 = mainsub.statements[3] as VarDecl
val initX2 = mainsub.statements[4] as Assignment
val declY1 = mainsub.statements[5] as VarDecl
val initY1 = mainsub.statements[6] as Assignment
val declY2 = mainsub.statements[7] as VarDecl
val initY2 = mainsub.statements[8] as Assignment
mainsub.statements[9] shouldBe instanceOf<Return>()
(declTest.value as NumericLiteralValue).number shouldBe 10.0
declX1.value shouldBe null
declX2.value shouldBe null
declY1.value shouldBe null
declY2.value shouldBe null
(initX1.value as NumericLiteralValue).type shouldBe DataType.BYTE
(initX1.value as NumericLiteralValue).number shouldBe 11.0
(initX2.value as NumericLiteralValue).type shouldBe DataType.BYTE
(initX2.value as NumericLiteralValue).number shouldBe 11.0
(initY1.value as NumericLiteralValue).type shouldBe DataType.UBYTE
(initY1.value as NumericLiteralValue).number shouldBe 11.0
(initY2.value as NumericLiteralValue).type shouldBe DataType.UBYTE
(initY2.value as NumericLiteralValue).number shouldBe 11.0
}
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test("typecasted assignment from ubyte logical expressoin to uword var") {
val src = """
main {
sub start() {
ubyte bb
uword ww
ww = not bb or not ww ; expression combining ubyte and uword
}
}
"""
val result = compileText(C64Target, false, src, writeAssembly = false).assertSuccess()
// ww = ((( not bb as uword) or not ww) as uword)
val wwAssign = result.program.entrypoint.statements.last() as Assignment
val expr = wwAssign.value as TypecastExpression
wwAssign.target.identifier?.nameInSource shouldBe listOf("ww")
expr.type shouldBe DataType.UWORD
expr.expression.inferType(result.program) istype DataType.UBYTE shouldBe true
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}
test("intermediate assignment steps have correct types for codegen phase (BeforeAsmGenerationAstChanger)") {
val src = """
main {
sub start() {
ubyte bb
uword ww
bb = not bb or not ww ; expression combining ubyte and uword
}
}
"""
val result = compileText(C64Target, false, src, writeAssembly = false).assertSuccess()
// bb = (( not bb as uword) or not ww)
val bbAssign = result.program.entrypoint.statements.last() as Assignment
val expr = bbAssign.value as BinaryExpression
expr.operator shouldBe "or"
expr.left shouldBe instanceOf<TypecastExpression>() // casted to word
expr.right shouldBe instanceOf<PrefixExpression>()
expr.left.inferType(result.program).getOrElse { fail("dt") } shouldBe DataType.UWORD
expr.right.inferType(result.program).getOrElse { fail("dt") } shouldBe DataType.UWORD
expr.inferType(result.program).getOrElse { fail("dt") } shouldBe DataType.UBYTE
val options = CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.DONTUSE, emptyList(), false, true, C64Target)
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result.program.processAstBeforeAsmGeneration(options, ErrorReporterForTests())
// assignment is now split into:
// bb = not bb
// bb = (bb or not ww)
val assigns = result.program.entrypoint.statements.filterIsInstance<Assignment>()
val bbAssigns = assigns.filter { it.value !is NumericLiteralValue }
bbAssigns.size shouldBe 2
bbAssigns[0].target.identifier!!.nameInSource shouldBe listOf("bb")
bbAssigns[0].value shouldBe instanceOf<PrefixExpression>()
(bbAssigns[0].value as PrefixExpression).operator shouldBe "not"
(bbAssigns[0].value as PrefixExpression).expression shouldBe IdentifierReference(listOf("bb"), Position.DUMMY)
bbAssigns[0].value.inferType(result.program).getOrElse { fail("dt") } shouldBe DataType.UBYTE
bbAssigns[1].target.identifier!!.nameInSource shouldBe listOf("bb")
val bbAssigns1expr = bbAssigns[1].value as BinaryExpression
bbAssigns1expr.operator shouldBe "or"
bbAssigns1expr.left shouldBe IdentifierReference(listOf("bb"), Position.DUMMY)
bbAssigns1expr.right shouldBe instanceOf<PrefixExpression>()
(bbAssigns1expr.right as PrefixExpression).operator shouldBe "not"
(bbAssigns1expr.right as PrefixExpression).expression shouldBe IdentifierReference(listOf("ww"), Position.DUMMY)
bbAssigns1expr.inferType(result.program).getOrElse { fail("dt") } shouldBe DataType.UBYTE
val asm = generateAssembly(result.program, options)
asm.valid shouldBe true
}
test("intermediate assignment steps generated for typecasted expression") {
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val src = """
main {
sub start() {
ubyte r
ubyte @shared bb = (cos8(r)/2 + 100) as ubyte
}
}
"""
val result = compileText(C64Target, true, src, writeAssembly = true).assertSuccess()
/* turned into:
ubyte r
r = 0
ubyte bb
prog8_lib.retval_interm_b = cos8(r)
prog8_lib.retval_interm_b >>= 1
prog8_lib.retval_interm_b += 100
bb = prog8_lib.retval_interm_b
return
*/
val st = result.program.entrypoint.statements
st.size shouldBe 8
st.last() shouldBe instanceOf<Return>()
var assign = st[3] as Assignment
assign.target.identifier!!.nameInSource shouldBe listOf("prog8_lib","retval_interm_b")
assign = st[4] as Assignment
assign.target.identifier!!.nameInSource shouldBe listOf("prog8_lib","retval_interm_b")
assign = st[5] as Assignment
assign.target.identifier!!.nameInSource shouldBe listOf("prog8_lib","retval_interm_b")
assign = st[6] as Assignment
assign.target.identifier!!.nameInSource shouldBe listOf("bb")
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}
test("asmgen correctly deals with float typecasting in augmented assignment") {
val src="""
%option enable_floats
main {
sub start() {
ubyte ub
float ff = 1.0
ff += (ub as float) ; operator doesn't matter
}
}
"""
val result = compileText(C64Target, optimize=false, src, writeAssembly = false).assertSuccess()
val assignFF = result.program.entrypoint.statements.last() as Assignment
assignFF.isAugmentable shouldBe true
assignFF.target.identifier!!.nameInSource shouldBe listOf("ff")
val value = assignFF.value as BinaryExpression
value.operator shouldBe "+"
value.left shouldBe IdentifierReference(listOf("ff"), Position.DUMMY)
value.right shouldBe instanceOf<TypecastExpression>()
val asm = generateAssembly(result.program)
asm.valid shouldBe true
}
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test("unused variable removal") {
val src="""
main {
sub start() {
ubyte unused
ubyte @shared unused_but_shared ; this one should remain
ubyte usedvar_only_written
usedvar_only_written=2
usedvar_only_written++
ubyte usedvar ; and this one too
usedvar = msb(usedvar)
}
}
"""
val result = compileText(C64Target, optimize=true, src, writeAssembly=false).assertSuccess()
result.program.entrypoint.statements.size shouldBe 4 // unused_but_shared decl, unused_but_shared=0, usedvar decl, usedvar assign
val (decl, assign, decl2, assign2) = result.program.entrypoint.statements
decl shouldBe instanceOf<VarDecl>()
(decl as VarDecl).name shouldBe "unused_but_shared"
assign shouldBe instanceOf<Assignment>()
decl2 shouldBe instanceOf<VarDecl>()
(decl2 as VarDecl).name shouldBe "usedvar"
assign2 shouldBe instanceOf<Assignment>()
}
test("unused variable removal from subscope") {
val src="""
main {
sub start() {
if cx16.r0 {
uword xx = 42 ; to be removed
xx=99 ; to be removed
cx16.r0 = 0
}
func2()
sub func2() {
uword yy = 33 ; to be removed
yy=99 ; to be removed
cx16.r0 = 0
}
}
}"""
val result = compileText(C64Target, optimize=true, src, writeAssembly=false).assertSuccess()
result.program.entrypoint.statements.size shouldBe 3
val ifstmt = result.program.entrypoint.statements[0] as IfElse
ifstmt.truepart.statements.size shouldBe 1
(ifstmt.truepart.statements[0] as Assignment).target.identifier!!.nameInSource shouldBe listOf("cx16", "r0")
val func2 = result.program.entrypoint.statements[2] as Subroutine
func2.statements.size shouldBe 1
(func2.statements[0] as Assignment).target.identifier!!.nameInSource shouldBe listOf("cx16", "r0")
}
test("test simple augmented assignment optimization correctly initializes all variables") {
val src="""
main {
sub start() {
ubyte @shared z1
z1 = 10
ubyte @shared z2
z2 = ~z2
ubyte @shared z3
z3 = not z3
uword @shared z4
z4 = (z4 as ubyte)
ubyte @shared z5
z5 = z1+z5+5
ubyte @shared z6
z6 = z1+z6-5
}
}"""
val result = compileText(C64Target, optimize=true, src, writeAssembly=false).assertSuccess()
/* expected:
ubyte z1
z1 = 10
ubyte z2
z2 = 255
ubyte z3
z3 = 1
uword z4
z4 = 0
ubyte z5
z5 = z1
z5 += 5
ubyte z6
z6 = z1
z6 -= 5
*/
val statements = result.program.entrypoint.statements
statements.size shouldBe 14
val z1decl = statements[0] as VarDecl
val z1init = statements[1] as Assignment
val z2decl = statements[2] as VarDecl
val z2init = statements[3] as Assignment
val z3decl = statements[4] as VarDecl
val z3init = statements[5] as Assignment
val z4decl = statements[6] as VarDecl
val z4init = statements[7] as Assignment
val z5decl = statements[8] as VarDecl
val z5init = statements[9] as Assignment
val z5plus = statements[10] as Assignment
val z6decl = statements[11] as VarDecl
val z6init = statements[12] as Assignment
val z6plus = statements[13] as Assignment
z1decl.name shouldBe "z1"
z1init.value shouldBe NumericLiteralValue(DataType.UBYTE, 10.0, Position.DUMMY)
z2decl.name shouldBe "z2"
z2init.value shouldBe NumericLiteralValue(DataType.UBYTE, 255.0, Position.DUMMY)
z3decl.name shouldBe "z3"
z3init.value shouldBe NumericLiteralValue(DataType.UBYTE, 1.0, Position.DUMMY)
z4decl.name shouldBe "z4"
z4init.value shouldBe NumericLiteralValue(DataType.UBYTE, 0.0, Position.DUMMY)
z5decl.name shouldBe "z5"
z5init.value shouldBe IdentifierReference(listOf("z1"), Position.DUMMY)
z5plus.isAugmentable shouldBe true
(z5plus.value as BinaryExpression).operator shouldBe "+"
(z5plus.value as BinaryExpression).right shouldBe NumericLiteralValue(DataType.UBYTE, 5.0, Position.DUMMY)
z6decl.name shouldBe "z6"
z6init.value shouldBe IdentifierReference(listOf("z1"), Position.DUMMY)
z6plus.isAugmentable shouldBe true
(z6plus.value as BinaryExpression).operator shouldBe "-"
(z6plus.value as BinaryExpression).right shouldBe NumericLiteralValue(DataType.UBYTE, 5.0, Position.DUMMY)
}
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test("force_output option should work with optimizing memwrite assignment") {
val src="""
main {
%option force_output
sub start() {
uword aa
ubyte zz
@(aa) = zz + 32
}
}
"""
val result = compileText(C64Target, optimize=true, src, writeAssembly=false).assertSuccess()
val stmts = result.program.entrypoint.statements
stmts.size shouldBe 6
val assign=stmts.last() as Assignment
(assign.target.memoryAddress?.addressExpression as IdentifierReference).nameInSource shouldBe listOf("aa")
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}
test("don't optimize memory writes away") {
val src="""
main {
sub start() {
uword aa
ubyte zz
@(aa) = zz + 32 ; do not optimize this away!
}
}
"""
val result = compileText(C64Target, optimize=true, src, writeAssembly=false).assertSuccess()
val stmts = result.program.entrypoint.statements
stmts.size shouldBe 6
val assign=stmts.last() as Assignment
(assign.target.memoryAddress?.addressExpression as IdentifierReference).nameInSource shouldBe listOf("aa")
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}
test("correctly process constant prefix numbers") {
val src="""
main {
sub start() {
ubyte @shared z1 = 1
ubyte @shared z2 = + 1
ubyte @shared z3 = ~ 1
ubyte @shared z4 = not 1
byte @shared z5 = - 1
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}
}
"""
val result = compileText(C64Target, optimize=true, src, writeAssembly=false).assertSuccess()
val stmts = result.program.entrypoint.statements
stmts.size shouldBe 10
stmts.filterIsInstance<VarDecl>().size shouldBe 5
stmts.filterIsInstance<Assignment>().size shouldBe 5
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}
test("correctly process constant prefix numbers with type mismatch and give error") {
val src="""
main {
sub start() {
ubyte @shared z1 = - 1
}
}
"""
val errors = ErrorReporterForTests()
compileText(C64Target, optimize=true, src, writeAssembly=false, errors = errors).assertFailure()
errors.errors.size shouldBe 1
errors.errors[0] shouldContain "type of value BYTE doesn't match target UBYTE"
}
test("test augmented expression asmgen") {
val src = """
main {
sub start() {
ubyte c
ubyte r
ubyte q
r = (q+r)-c
q=r
r = q+(r-c)
q=r
}
}"""
val result = compileText(C64Target, optimize=false, src, writeAssembly=true).assertSuccess()
result.program.entrypoint.statements.size shouldBe 11
result.program.entrypoint.statements.last() shouldBe instanceOf<Return>()
}
test("keep the value initializer assignment if the next one depends on it") {
val src="""
main {
sub start() {
uword @shared yy
yy = 20 ; ok to remove =0 initializer before this
uword @shared zz
zz += 60 ; NOT ok to remove initializer, should evaluate to 60
ubyte @shared xx
xx = 6+sin8u(xx) ; NOT ok to remove initializer
}
}
"""
val result = compileText(C64Target, optimize=true, src, writeAssembly=false).assertSuccess()
/* expected result:
uword yy
yy = 20
uword zz
zz = 60
ubyte xx
xx = sin8u(xx)
xx += 6
*/
val stmts = result.program.entrypoint.statements
stmts.size shouldBe 7
stmts.filterIsInstance<VarDecl>().size shouldBe 3
stmts.filterIsInstance<Assignment>().size shouldBe 4
}
test("only substitue assignments with 0 after a =0 initializer if it is the same variable") {
val src="""
main {
sub start() {
uword @shared xx
xx = xx + 20 ; is same var so can be changed just fine into xx=20
uword @shared yy
xx = 20
yy = 0 ; is other var..
xx = xx+10 ; so this should not be changed into xx=10
}
}"""
val result = compileText(C64Target, optimize=true, src, writeAssembly=false).assertSuccess()
/*
expected result:
uword xx
xx = 20
uword yy
yy = 0
xx = 20
yy = 0
xx += 10
*/
printProgram(result.program)
val stmts = result.program.entrypoint.statements
stmts.size shouldBe 7
stmts.filterIsInstance<VarDecl>().size shouldBe 2
stmts.filterIsInstance<Assignment>().size shouldBe 5
val assignXX1 = stmts[1] as Assignment
assignXX1.target.identifier!!.nameInSource shouldBe listOf("xx")
assignXX1.value shouldBe NumericLiteralValue(DataType.UBYTE, 20.0, Position.DUMMY)
val assignXX2 = stmts.last() as Assignment
assignXX2.target.identifier!!.nameInSource shouldBe listOf("xx")
val xxValue = assignXX2.value as BinaryExpression
xxValue.operator shouldBe "+"
xxValue.left shouldBe IdentifierReference(listOf("xx"), Position.DUMMY)
xxValue.right shouldBe NumericLiteralValue(DataType.UBYTE, 10.0, Position.DUMMY)
}
})